This story is getting bigger and bigger. Even though most Americans probably already knew, it is now official: the United States government, through its National Security Agency, is collecting the communications and data of all American citizens, and of non-Americans using American services, through a wide collaboration with the large companies in technology, like Apple, Google, Microsoft, Facebook, and so on. Interestingly enough, the NSA itself, as well as the US government, have repeatedly and firmly denied this massive spying on Americans and non-Americans took place at all.

Like traveling to Cuba "
Great example. Forbidding citizens from visiting few countries considered hostile (which is, BTW, done by almost every country) as compared to almost total ban on visits abroad (less severe in case of socialist countries and almost total for capitalist countries).

A US soldier is also a US citizen, and when you send a soldier to die just because USA doesn't like the political stance of some government I think is virtually the same as murder.

And how many people are held in Guantanamo, as compared to Gulag?

I don't think is a matter of quantity but quality. As someone else pointed although Guantanamo prisoners are considered terrorist even prisoners have the right to a fair trial.

Can you name more of these "many" politicians?

Jorge Eliecer Gaitan in Colombia and the many killed by the Operation Condor in Latin America which targeted every leftist activist, or the support of Ronald Reagan to central american rightist dictators that murdered hundreds of leftist activist.

Great example. Forbidding citizens from visiting few countries considered hostile

Cuba has never been particularly hostile against north american tourists after the cold war.

As I said every county facing similar circumstances will do the same so we cannot call every other county better or worst.

Hostility towards Cuba was of course justified since they were about to point nuclear weapons against US but also remember that US supported Fidel Castro to overthrow their democratically elected president just because he wasn't pro American.

And also the leftist leaders in the rest of Latin America were not particularly interested in supporting Russia or USA they just wanted fair labor conditions, the same rights that USA workers had won and enjoy. Yet the USA saw that as communism and targeted those counties as well.